Effervescent laundry bluing.



UNITED STATES Patented September 8, 1903,

PATENT OFFICE.

WILLIAM G POPE, OF ST. LOUIS, MISSOURI.

EFFERVESCENT LAUNDRY BLUING.

SPECIFICATION forming part of Letters Patent No. 738,481, datedSeptember 8, 1903.

Application filed February 21, 1908. Serial No. 144,507. (No specimens.)

To aZZ whom it may concern.-

Be it known that I,WILLIAM 0. Porn, a citizen of the United States,residing at St. Louis,

State of Missouri, have invented certain new and useful Improvements inEffervescent Laundry Bluing; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to m ake and usethe same.

My invention consists in an effervescent coloring substance, preferablyin form of a tablet, or granular, as an article of manufacture and inthe method of making the same.

The substance consists, specifically, of a suitable blue and oxalicacid, with a soluble alkaline carbonate, such as bicarbonate of soda,and tartaric acid, or citric acid, or both.

I will describe one method of producing my improved effervescent bluingsubstance, which in practice I have found to be very satisfactory andgive an example of one composition thereof. I prefer to form twoseparate mixtures, which are subsequently combined, preferably in equalparts. The first mixture is preferably composed of six pounds and twoounces of soluble blue (say Tiemans) and three pounds of oxalic acid.The second mixture preferably pounds two ounces of bicarbonate ofsoda,four pounds eleven ounces of tartaric acid, and six pounds elevenounces of citric acid, all of these ingredients being mixed well. I takeequal parts of the two mixtures and after thoroughly commingling themgranulate the mass.

and then preferably finally press the granules into tablets, each tabletweighing, say, six grains.

In order to granulate the mass as above described, it is placed in apan, preferably over a water-bath, for the purpose of driving off themoisture from the acids, which moisture combines with the otheringredients to form a solid mass. This solid mass while hot is rubbedthrough sieves of the proper mesh to form particles of the proper size,said particles being afterward spread on trays and heated for thepurpose of drying them. When dried, they are pressed into tablets, asdescribed.

In giving the proportions as above stated I do not wish to be limited tothe exact amounts consists of thirteen set forth nor to the preciseingredients employed as the same may be changed without The effect ofmaking a bluing or other coloring substance effervescent is to make thecolor automatically diifusive-that is to say, to cause the color by thesubstance itself to be distributed throughout the water or other liquidto be colored with rapidity and remarkable evenness without stirring orother mechanical operation, such as agitation-and the effervescence alsocauses the particles of color to be carried away from the substance ormass itself, whereby there will be no sediment or portion thereof leftundissolved.

Having thus described my invention, what I claim as new, and desire tosecure byLetters Patent, is

1. As a new article of manufacture, an effervescent bluing compoundcontaining matter to render the blue soluble, substantially asdescribed.

2. As a new article of manufacture, a bluing substance comprisingsoluble bluing pigment and eifervescent materials, substantially asdescribed.

3. As a new article of manufacture, a blu ing substance composed ofsoluble bluing pigment, oxalic acid, a suitable alkaline carbonate, andsuitable acid, which, in solution, dis- 7. An efiervescentcoloring-tablet includtartaric acid, oxalic acid, an alkaline carbon- 10ing tartaric acid, citric acid, oxalic acid, soate, and soluble blue;substantially as dedium bicarbonate, and soluble blue; substanscribed.

tially as described. l 111 testimony whereof I affix my signature 5 8.An effervescent coloring mass containing in the presence of twosubscribing Witnesses.

tartaric acid, oxalic acid, citric acid, an alka- WILLIAM C. POPE.

line carbonate, and soluble blue; substan- Vitnesses:

tially as described. R. G. DYRENFORTH,

9. A11 effervescent coloring-tabletincluding E. T. BRANDENBURG.

